Presentation
Persistent pain and locking of the left knee after trauma.
Patient Data
Vertical tearing of the medial meniscus with a laterally displaced fragment from its posterior horn, located in the intercondylar fossa, anteromedial to the posterior cruciate ligament.
An incomplete vertical tear at the posterior horn of the lateral meniscus, separating its peripheral zone's upper surface from the capsule, also called a "ramp lesion". Meniscal flounce at the anterior horn of the lateral meniscus.
Multiple free osteochondral fragments in the joint space, likely detached from the medial femoral condyle and lateral tibial plateau, lying posterior to the PCL and inside the Hoffa's recess, respectively.
Complete anterior cruciate ligament tear. PCL is intact.
Low-grade sprain of the posterior oblique ligament.
Moderate-sized joint effusion, suprapatellar plica, and a 57mm popliteal cyst.
Degenerative changes at both tibiofemoral compartments.
Case Discussion
Displaced meniscal fragments should be addressed on the knee MRI, not to be missed at arthroscopy. On the medial side they are more commonly located at the posterior joint space, near the PCL. Less commonly they lie in the recesses above or below the meniscal body.
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